Dozens of Disney characters march down Main Street U.S.A. on Oct. 1, 2011, in the Magic Kingdom at Walt Disney World Resort in Lake Buena Vista, Florida, during a special ceremony to mark Walt Disney World's 40th anniversary. The resort opened Oct. 1, 1971.

Dozens of Disney characters march down Main Street U.S.A. on Oct. 1, 2011, in the Magic Kingdom at Walt Disney World Resort in Lake Buena Vista, Florida, during a special ceremony to mark Walt Disney World's 40th anniversary. The resort opened Oct. 1, 1971. (Ron Riccio, Walt Disney Co.)

Dozens of Disney characters march down Main Street U.S.A. on Oct. 1, 2011, in the Magic Kingdom at Walt Disney World Resort in Lake Buena Vista, Florida, during a special ceremony to mark Walt Disney World's 40th anniversary. The resort opened Oct. 1, 1971.